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-rw-r--r--mm/fremap.c48
1 files changed, 18 insertions, 30 deletions
diff --git a/mm/fremap.c b/mm/fremap.c
index 49719a3..d862be3 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -63,23 +63,20 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
pud_t *pud;
pgd_t *pgd;
pte_t pte_val;
+ spinlock_t *ptl;
BUG_ON(vma->vm_flags & VM_RESERVED);
pgd = pgd_offset(mm, addr);
- spin_lock(&mm->page_table_lock);
-
pud = pud_alloc(mm, pgd, addr);
if (!pud)
- goto err_unlock;
-
+ goto out;
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
- goto err_unlock;
-
- pte = pte_alloc_map(mm, pmd, addr);
+ goto out;
+ pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
if (!pte)
- goto err_unlock;
+ goto out;
/*
* This page may have been truncated. Tell the
@@ -89,10 +86,10 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
inode = vma->vm_file->f_mapping->host;
size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (!page->mapping || page->index >= size)
- goto err_unlock;
+ goto unlock;
err = -ENOMEM;
if (page_mapcount(page) > INT_MAX/2)
- goto err_unlock;
+ goto unlock;
if (pte_none(*pte) || !zap_pte(mm, vma, addr, pte))
inc_mm_counter(mm, file_rss);
@@ -101,17 +98,15 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
set_pte_at(mm, addr, pte, mk_pte(page, prot));
page_add_file_rmap(page);
pte_val = *pte;
- pte_unmap(pte);
update_mmu_cache(vma, addr, pte_val);
-
err = 0;
-err_unlock:
- spin_unlock(&mm->page_table_lock);
+unlock:
+ pte_unmap_unlock(pte, ptl);
+out:
return err;
}
EXPORT_SYMBOL(install_page);
-
/*
* Install a file pte to a given virtual memory address, release any
* previously existing mapping.
@@ -125,23 +120,20 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
pud_t *pud;
pgd_t *pgd;
pte_t pte_val;
+ spinlock_t *ptl;
BUG_ON(vma->vm_flags & VM_RESERVED);
pgd = pgd_offset(mm, addr);
- spin_lock(&mm->page_table_lock);
-
pud = pud_alloc(mm, pgd, addr);
if (!pud)
- goto err_unlock;
-
+ goto out;
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
- goto err_unlock;
-
- pte = pte_alloc_map(mm, pmd, addr);
+ goto out;
+ pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
if (!pte)
- goto err_unlock;
+ goto out;
if (!pte_none(*pte) && zap_pte(mm, vma, addr, pte)) {
update_hiwater_rss(mm);
@@ -150,17 +142,13 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
set_pte_at(mm, addr, pte, pgoff_to_pte(pgoff));
pte_val = *pte;
- pte_unmap(pte);
update_mmu_cache(vma, addr, pte_val);
- spin_unlock(&mm->page_table_lock);
- return 0;
-
-err_unlock:
- spin_unlock(&mm->page_table_lock);
+ pte_unmap_unlock(pte, ptl);
+ err = 0;
+out:
return err;
}
-
/***
* sys_remap_file_pages - remap arbitrary pages of a shared backing store
* file within an existing vma.
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